CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Sep. 30, 2019	Dec. 31, 2018
CONSOLIDATED BALANCE SHEETS
Preferred shares, par value	$ 0.01	$ 0.01
Preferred shares, shares authorized	10,000,000	10,000,000
Preferred shares, shares issued	0	0
Preferred shares, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	60,000,000	60,000,000
Common stock, shares issued	22,800,000	23,700,000
Common stock, shares outstanding	22,800,000	23,700,000